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Pension Plans and Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 7,900 $ 11,800 $ 12,400
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 7,515 11,116 11,667
Interest cost 47,638 30,924 27,170
Expected return on plan assets (60,437) (83,254) (81,778)
Amortization of prior service cost 3,238 3,257 3,097
Recognized net actuarial loss (gain) 31,755 52,202 (34,690)
Net periodic benefit cost (income) 29,709 14,245 (74,534)
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 338 650 760
Interest cost 2,139 1,387 1,197
Expected return on plan assets (2,536) (2,974) (2,891)
Amortization of prior service cost 40 26 (178)
Recognized net actuarial loss (gain) (946) (5,616) (4,876)
Net periodic benefit cost (income) $ (965) $ (6,527) $ (5,988)